tomoaki/hakmem

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History

Moe Charm (CI) d0b931b197 Phase 3 C1: TLS Prefetch Implementation - NEUTRAL Result (Research Box)

Step 1 & 2 Complete:
- Implemented: core/front/malloc_tiny_fast.h prefetch (lines 264-267, 331-334)
  - LEGACY path prefetch of g_unified_cache[class_idx] to L1
  - ENV gate: HAKMEM_TINY_PREFETCH=0/1 (default OFF)
  - Conditional: only when prefetch enabled + route_kind == LEGACY

- A/B test (Mixed 10-run): PREFETCH=0 (39.33M) → =1 (39.20M) = -0.34% avg
  - Median: +1.28% (within ±1.0% neutral range)
  - Result: 🔬 NEUTRAL (research box, default OFF)

Decision: FREEZE as research box
- Average -0.34% suggests prefetch overhead > benefit
- Prefetch timing too late (after route_kind selection)
- TLS cache access is already fast (head/tail indices)
- Actual memory wait happens at slots[] array access (after prefetch)

Technical Learning:
- Prefetch effectiveness depends on L1 miss rate at access time
- Inserting prefetch after route selection may be too late
- Future approach: move prefetch earlier or use different target

Next: Phase 3 C2 (Metadata Cache Optimization, expected +5-10%)

🤖 Generated with Claude Code

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

2025-12-13 19:01:57 +09:00

..

Phase 3 C1: TLS Prefetch Implementation - NEUTRAL Result (Research Box)

2025-12-13 19:01:57 +09:00

P0 Optimization: Shared Pool fast path with O(1) metadata lookup

2025-12-04 16:21:54 +09:00

WIP: Add TLS SLL validation and SuperSlab registry fallback

2025-12-03 20:42:28 +09:00

Incremental improvements: mid_desc cache, pool hotpath optimization, and doc updates

2025-12-10 14:00:57 +09:00

Implement Warm Pool Secondary Prefill Optimization (Phase B-2c Complete)

2025-12-04 23:31:54 +09:00

Debug Counters Implementation - Clean History

2025-11-05 12:31:14 +09:00

Phase 3 C1: TLS Prefetch Implementation - NEUTRAL Result (Research Box)

2025-12-13 19:01:57 +09:00

Phase FREE-DISPATCHER-OPT-1: free dispatcher 統計計測

2025-12-11 21:21:40 +09:00

ACE_LEARNING_LAYER_PLAN.md

Debug Counters Implementation - Clean History

2025-11-05 12:31:14 +09:00

ACE_LEARNING_LAYER.md

WIP: Add TLS SLL validation and SuperSlab registry fallback

2025-12-03 20:42:28 +09:00

ANALYSIS_SYMPTOM_PROLIFERATION.md

Critical analysis: symptom suppression vs root cause elimination

2025-12-04 03:09:28 +09:00

BENCH_REPORT_2025_11_09.md

Tiny: Enable P0→FC direct path for class7 (1KB) by default + docs

2025-11-09 23:15:02 +09:00

BREAKTHROUGH_STABILITY_ACHIEVED.md

Document breakthrough: sh8bench stability achieved with SuperSlab refcount pinning

2025-12-03 21:57:36 +09:00

BUILD_PHASE7_POOL_TLS.md

Tiny: fix header/stride mismatch and harden refill paths

2025-11-09 18:55:50 +09:00

BUILDING_QUICKSTART.md

Tiny: fix remote sentinel leak → SEGV; add defense-in-depth; PoolTLS: refill-boundary remote drain; build UX help; quickstart docs

2025-11-09 16:49:34 +09:00

CHATGPT_CONTEXT_SUMMARY.md

Add comprehensive ChatGPT handoff documentation for TLS SLL diagnosis

2025-12-03 20:41:34 +09:00

CHATGPT_HANDOFF_TLS_DIAGNOSIS.md

Add comprehensive ChatGPT handoff documentation for TLS SLL diagnosis

2025-12-03 20:41:34 +09:00

CHATGPT_PROGRESS_AND_ISSUES.md

Add ChatGPT progress analysis and remaining issues documentation

2025-12-03 20:44:18 +09:00

CRASH_180s_INVESTIGATION_GUIDE.md

Fix critical integer overflow bug in TLS SLL trace counters

2025-12-04 10:38:19 +09:00

CRITICAL_DISCOVERY_TLS_HEAD_CORRUPTION.md

Document critical discovery: TLS head corruption is not offset issue

2025-12-03 21:02:04 +09:00

DEFENSIVE_LAYERS_MAPPING.md

Add defensive layers mapping and diagnostic logging enhancements

2025-12-04 04:15:10 +09:00

DOCS_REORG_PLAN.md

ENV cleanup: Remove BG/HotMag vars & guard fprintf (Larson 52.3M ops/s)

2025-11-26 14:45:26 +09:00

FINAL_ROOT_CAUSE_AND_RESOLUTION.md

Add comprehensive final report on root cause fix

2025-12-04 05:40:50 +09:00

FREE_SAFETY.md

Debug Counters Implementation - Clean History

2025-11-05 12:31:14 +09:00

GEMINI_HANDOFF_SUMMARY.md

Add comprehensive ChatGPT handoff documentation for TLS SLL diagnosis

2025-12-03 20:41:34 +09:00

HEADERLESS_STABILITY_DEBUG_INSTRUCTIONS.md

Add comprehensive ChatGPT handoff documentation for TLS SLL diagnosis

2025-12-03 20:41:34 +09:00

INDEX.md

ENV cleanup: Remove BG/HotMag vars & guard fprintf (Larson 52.3M ops/s)

2025-11-26 14:45:26 +09:00

INTEGER_OVERFLOW_BUG_FIX.md

Fix critical integer overflow bug in TLS SLL trace counters

2025-12-04 10:38:19 +09:00

PERF_ANALYSIS_TINY_MIXED.md

Debug Counters Implementation - Clean History

2025-11-05 12:31:14 +09:00

PHASE1_TLS_HINT_BENCHMARK.md

Implement Phase 1: TLS SuperSlab Hint Box for Headerless performance

2025-12-03 18:06:24 +09:00

PHASE2_BENCHMARK_RESULTS.md

Add Phase 2 benchmark results: Headerless ON/OFF comparison

2025-12-03 17:23:32 +09:00

PHASE2_HEADERLESS_INSTRUCTION_FOR_GEMINI.md

Add Phase 2 Headerless implementation instruction for Gemini

2025-12-03 11:41:34 +09:00

PHASE_E2_EXECUTIVE_SUMMARY.md

Phase E3-FINAL: Fix Box API offset bugs - ALL classes now use correct offsets

2025-11-13 06:50:20 +09:00

PHASE_E2_REGRESSION_ANALYSIS.md

Phase E3-FINAL: Fix Box API offset bugs - ALL classes now use correct offsets

2025-11-13 06:50:20 +09:00

PHASE_E2_VISUAL_COMPARISON.md

Phase E3-FINAL: Fix Box API offset bugs - ALL classes now use correct offsets

2025-11-13 06:50:20 +09:00

PHASE_E3_IMPLEMENTATION_PLAN.md

Phase E3-FINAL: Fix Box API offset bugs - ALL classes now use correct offsets

2025-11-13 06:50:20 +09:00

RAPID_DIAGNOSIS_CANARY_SANDWICH.md

Fix critical integer overflow bug in TLS SLL trace counters

2025-12-04 10:38:19 +09:00

README_HANDOFF_CHATGPT.md

Add comprehensive ChatGPT handoff documentation for TLS SLL diagnosis

2025-12-03 20:41:34 +09:00

README.md

Debug Counters Implementation - Clean History

2025-11-05 12:31:14 +09:00

REFACTOR_PLAN_GEMINI_ENHANCED.md

Update REFACTOR_PLAN to mark Phase 2 complete and document Magazine Spill fix

2025-12-03 17:16:19 +09:00

REFACTORING_INSTRUCTION_FOR_GEMINI.md

Add detailed refactoring instruction for Gemini - Phase 1 implementation

2025-12-03 11:20:59 +09:00

SEGFAULT_INVESTIGATION_FOR_GEMINI.md

Add comprehensive ChatGPT handoff documentation for TLS SLL diagnosis

2025-12-03 20:41:34 +09:00

SEGV_INVESTIGATION.md

Implement Phase 2: Headerless Allocator Support (Partial)

2025-12-03 12:11:27 +09:00

SESSION_SUMMARY_2025_12_04_INTEGER_OVERFLOW_FIX.md

Implement Phantom typing for Tiny FastCache layer

2025-12-04 11:05:06 +09:00

SESSION_SUMMARY_2025_12_04.md

Add comprehensive session summary: root cause fix + Box theory implementation

2025-12-04 06:12:47 +09:00

sh8bench_debug_instruction.md

sh8bench修正: LRU registry未登録問題 + self-heal修復

2025-12-03 09:15:59 +09:00

SLAB_HANDLE.md

Debug Counters Implementation - Clean History

2025-11-05 12:31:14 +09:00

STATUS_2025_12_03_CURRENT.md

Add comprehensive ChatGPT handoff documentation for TLS SLL diagnosis

2025-12-03 20:41:34 +09:00

TINY_C7_1KB_SEGV_TRIAGE.md

Tiny C7(1KB) SEGV triage hardening: always-on lightweight free-time guards for headerless class7 in both hak_tiny_free_with_slab and superslab free path (alignment/range check, fail-fast via SIGUSR2). Leave C7 P0/direct-FC gated OFF by default. Add docs/TINY_C7_1KB_SEGV_TRIAGE.md for Claude with repro matrix, hypotheses, instrumentation and acceptance criteria.

2025-11-10 01:59:11 +09:00

TINY_MODULARIZATION_ANALYSIS.md

Debug Counters Implementation - Clean History

2025-11-05 12:31:14 +09:00

TINY_MODULARIZATION_SUMMARY.md

Debug Counters Implementation - Clean History

2025-11-05 12:31:14 +09:00

TINY_P0_BATCH_REFILL.md

ENV cleanup: Remove BG/HotMag vars & guard fprintf (Larson 52.3M ops/s)

2025-11-26 14:45:26 +09:00

TINY_REDESIGN_CHECKLIST.md

Tiny Pool redesign: P0.1, P0.3, P1.1, P1.2 - Out-of-band class_idx lookup

2025-11-28 13:42:39 +09:00

tls_sll_hdr_reset_final_report.md

Add final investigation report for TLS_SLL_HDR_RESET

2025-12-03 11:14:59 +09:00

tls_sll_hdr_reset_for_gemini.md

Save current state before investigating TLS_SLL_HDR_RESET

2025-12-03 10:34:39 +09:00

tls_sll_hdr_reset_investigation_report.md

Fix TLS SLL race condition with atomic fence and report investigation results

2025-12-03 10:57:16 +09:00

tls_sll_hdr_reset_investigation_v2.md

Save current state before investigating TLS_SLL_HDR_RESET

2025-12-03 10:34:39 +09:00

TLS_SLL_HEADER_CORRUPTION_DIAGNOSIS.md

Add comprehensive ChatGPT handoff documentation for TLS SLL diagnosis

2025-12-03 20:41:34 +09:00

tls_sll_header_corruption_investigation.md

Save current state before investigating TLS_SLL_HDR_RESET

2025-12-03 10:34:39 +09:00

TLS_SS_HINT_BOX_DESIGN.md

Add comprehensive ChatGPT handoff documentation for TLS SLL diagnosis

2025-12-03 20:41:34 +09:00

README.md

Docs Overview

このフォルダは hakmem の設計・計測・運用メモを体系化して管理する場所です。

INDEX.md: 目次（各ドキュメントへのリンク）
benchmarks/: ベンチマーク手順とスイープ結果の保存先
specs/: 現在の仕様（SACS‑3/HW/ENV）を集約
roadmap/: これからの実装計画・優先度・タスク

運用ルール（提案）

1つの変更/計測のまとまりにつき1ファイル（or 1フォルダ）
再現コマンド・環境変数・ハード構成は必ず記載
大きな連続出力はファイルへ保存し、本文からは抜粋/要約を記載